The
PostGIS Connector is used to
define a connection with a specific PostGIS database.  It is
accessed through the 
Data
Source Selector.
To define PostGIS database as a data source,  fill the 
Title and the 
Connection Information
needed by PostGIS including the 
Database
Name.
Open will
make this connection available at 
Data
Source Selector with the same title specified here.
It is possible to 
Test
the connection
before open it.
Also there is 
Advanced
Connections Options
to change same default
parameters. It is possible to hide spatial metadata tables
(spatial_ref_sys, geometry_columns) , to define new connection pooling
parameter and so on.